* {
    margin: 0;
    padding: 0;
}

body {
    background: url(../images/kobe2.jpg) center center;
    height: 600px;
    width: 100%;
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='../images/kobe2.jpg', sizingMethod='scale');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    background-attachment: scroll;
    font-family: "微软雅黑";
}
.main{
    margin: 50px auto;
    width: 400px;
    height: 150px;
    border: 2px solid #eee;
    border-bottom: none;
    position: relative;
    background: #fff;
    font-size: 16px;
}
a{
    text-decoration: none;
    text-align: center;
}
.button_blue {
    display: inline-block;
    float: left;
    height: 30px;
    border-radius: 4px;
    background: #2795dc;
    border: none;
    cursor: pointer;
    border-bottom: 3px solid #0078b3;
    color: #fff;
    font-size: 16px;
    padding: 10px 20px 0 20px;
    width: 160px;
    outline: none;
}
a:hover {
    background: #0081c1;
    border-bottom: 3px solid #006698;
    color: #fff;
    text-decoration: none;
}